Fixed crash when moving horizontal slider thumb in preview with no toolpath active

src/slic3r/GUI/GCodeViewer.cpp

@@ -1689,6 +1689,8 @@ void GCodeViewer::refresh_render_paths(bool keep_sequential_current_first, bool
             break;
     }
 
+    unsigned int render_paths_count = 0;
+
     // second pass: filter paths by sequential data and collect them by color
     for (const auto& [buffer, index_buffer_id, path_id] : paths) {
         const Path& path = buffer->paths[path_id];
@@ -1711,6 +1713,7 @@ void GCodeViewer::refresh_render_paths(bool keep_sequential_current_first, bool
             it->color = color;
             it->path_id = path_id;
             it->index_buffer_id = index_buffer_id;
+            ++render_paths_count;
         }
 
         unsigned int segments_count = std::min(m_sequential_view.current.last, path.last.s_id) - std::max(m_sequential_view.current.first, path.first.s_id) + 1;
@@ -1733,6 +1736,8 @@ void GCodeViewer::refresh_render_paths(bool keep_sequential_current_first, bool
         it->offsets.push_back(static_cast<size_t>((path.first.i_id + delta_1st) * sizeof(unsigned int)));
     }
 
+    wxGetApp().plater()->enable_preview_moves_slider(render_paths_count > 0);
+
 #if ENABLE_GCODE_VIEWER_STATISTICS
     for (const TBuffer& buffer : m_buffers) {
         m_statistics.render_paths_size += SLIC3R_STDVEC_MEMSIZE(buffer.render_paths, RenderPath);

src/slic3r/GUI/GUI_Preview.cpp

@@ -1162,8 +1162,7 @@ void Preview::update_moves_slider()
 
     std::vector<double> values(view.endpoints.last - view.endpoints.first + 1);
     unsigned int count = 0;
-    for (unsigned int i = view.endpoints.first; i <= view.endpoints.last; ++i)
-    {
+    for (unsigned int i = view.endpoints.first; i <= view.endpoints.last; ++i) {
         values[count++] = static_cast<double>(i + 1);
     }
 
@@ -1171,6 +1170,12 @@ void Preview::update_moves_slider()
     m_moves_slider->SetMaxValue(view.endpoints.last - view.endpoints.first);
     m_moves_slider->SetSelectionSpan(view.current.first - view.endpoints.first, view.current.last - view.endpoints.first);
 }
+
+void Preview::enable_moves_slider(bool enable)
+{
+    if (m_moves_slider != nullptr)
+        m_moves_slider->Enable(enable);
+}
 #else
 void Preview::update_double_slider_from_canvas(wxKeyEvent & event)
 {

src/slic3r/GUI/GUI_Preview.hpp

@@ -194,6 +194,7 @@ Preview(wxWindow* parent, Model* model, DynamicPrintConfig* config,
 #if ENABLE_GCODE_VIEWER
     void update_bottom_toolbar();
     void update_moves_slider();
+    void enable_moves_slider(bool enable);
     void hide_layers_slider();
 #endif // ENABLE_GCODE_VIEWER
 

src/slic3r/GUI/Plater.cpp

@@ -1612,9 +1612,8 @@ struct Plater::priv
 #if ENABLE_GCODE_VIEWER
     void update_preview_bottom_toolbar();
     void update_preview_moves_slider();
-#endif // ENABLE_GCODE_VIEWER
+    void enable_preview_moves_slider(bool enable);
 
-#if ENABLE_GCODE_VIEWER
     void reset_gcode_toolpaths();
 #endif // ENABLE_GCODE_VIEWER
 
@@ -4105,9 +4104,12 @@ void Plater::priv::update_preview_moves_slider()
 {
     preview->update_moves_slider();
 }
-#endif // ENABLE_GCODE_VIEWER
 
-#if ENABLE_GCODE_VIEWER
+void Plater::priv::enable_preview_moves_slider(bool enable)
+{
+    preview->enable_moves_slider(enable);
+}
+
 void Plater::priv::reset_gcode_toolpaths()
 {
     preview->get_canvas3d()->reset_gcode_toolpaths();
@@ -5898,6 +5900,11 @@ void Plater::update_preview_moves_slider()
     p->update_preview_moves_slider();
 }
 
+void Plater::enable_preview_moves_slider(bool enable)
+{
+    p->enable_preview_moves_slider(enable);
+}
+
 void Plater::reset_gcode_toolpaths()
 {
     p->reset_gcode_toolpaths();

src/slic3r/GUI/Plater.hpp

@@ -316,6 +316,7 @@ public:
 #if ENABLE_GCODE_VIEWER
     void update_preview_bottom_toolbar();
     void update_preview_moves_slider();
+    void enable_preview_moves_slider(bool enable);
 
     void reset_gcode_toolpaths();
     void reset_last_loaded_gcode() { m_last_loaded_gcode = ""; }